HPI Racing Nitro Star F4.6 V2 Engine – 4.6cc Big-Block Nitro for Savage Monster Trucks

Overview

The HPI Racing Nitro Star F4.6 V2 Engine is a powerful 4.6cc big-block nitro engine designed to deliver massive torque, strong acceleration, and blistering top-end speed. Best known as the powerhouse behind the Savage X 4.6, this engine is now available as a standalone upgrade for Savage-series and other big-block monster truck platforms.

The V2 update introduces a redesigned crankcase and cooling head with larger heatsink fins, improving cooling efficiency while making the engine 37g lighter and 12mm shorter. With 2.9 horsepower and an 8-port race-tuned sleeve, the F4.6 V2 delivers a huge powerband all the way to 32,000 RPM.

Key Features

• Updated V2 crankcase and heatsink design
• Larger cooling fins for improved thermal management
• 37g lighter and 12mm shorter than previous version
• Rear exhaust configuration
• Heavy-duty pull starter with reinforced one-way bearing
• 8-port race-tuned sleeve
• F1-7.5 composite slide carburetor (7.5mm)
• Optimized for Savage-class monster trucks

Performance Benefits

• Massive low-end torque for wheelies and hard launches
• Strong mid-range punch with extended top-end RPM
• 2.9 HP @ 32,000 RPM
• Aggressive power delivery
• Heat-resistant composite carburetor

Usage Notes

• Best Used With RC Scale(s): 1/8 scale Savage-class monster trucks (Savage X, Savage XL, etc.)
• Engine supplied fully assembled with pull start installed
• Exhaust system, clutch, flywheel, and glow plug not included
• Proper break-in and tuning required
• Compatible with standard big-block engine mounts and exhausts
• Recommended Glow Plug: Cold R5

Technical Specs

• Manufacturer: HPI Racing
• Part Number: 111595
• Displacement: 4.6cc
• Engine Class: .28-Class
• Bore: 18.68mm
• Stroke: 16.6mm
• Power Output: 2.9 HP @ 32,000 RPM
• Carburetor: F1-7.5 composite, 7.5mm
• Sleeve: 8-port race-tuned
• Starting System: Pull start with reinforced one-way bearing

What's Included

• 1x HPI Racing Nitro Star F4.6 V2 Big-Block Nitro Engine with Pull Start

Summary

Unleash big-block nitro power with the HPI Racing Nitro Star F4.6 V2. Massive torque, V2 design improvements, and proven Savage-class performance.